HEY GUYSI HAVE A COMMUNICATION PROBLEM ON A HEAVY TRUCK(CUMMINS ENGINE) SEE IF I COULD GET SOME HELP WITH.NO COMMUNICATION WITH SCAN TOOL. CHECKED FOR + AND - AT THE DLC CONNECTOR-YES.CHECKED J1939 WIRES WITH PICO- CAN HI IS SHOWING GOOD, EVEN DECODED IT IS GIVING ME INFORMATIONCAN LOW IS SAYING THERE IS A PROBLEM WITH THE DATA. I WILL UPLOAD THE WAVEFORM SOON.THERE IS DEFINITLEY AN ISSUE WITH THE LOW SIDE. I CHECKED IT IN 3 DIFFERENT SPOTS-ALL SAMERIGHT AT THE PCM IT IS THE SAME ALSO.WHERE SHOULD I GO FROM HERE?THANKS GUYS